Answer:
Big A: x^2+12x+36
Little A: x^2
Combined: 2x^2+12x+36
Area of little walkway is: 12x + 36
Explanation:
Big A: (x+6)(x+6) => Multiply using FOIL => x^2+12x+36
Little A: (x)(x) => Multiply => x^2
Combined: (x^2+12x+36)+(x^2) => Combine like terms => 2x^2+12x+36
Area of little walkway is: (x^2+12x+36)-(x^2) => subtract like terms => 12x+36